bmi = weight/height**2

if bmi < 18.5:

    print('过轻')

elif bmi>=18.5 and bmi < 25:

    print('正常')

elif bmi>=25 and bmi < 28:

    print('过重')

elif bmi>=28 and bmi <= 32:

    print('肥胖')

else:

    print('严重肥胖')